Maximum Light Bulbs on a 110V Circuit with 20A Limit?

[Jabababa]

Homework Statement

What is the maximum number of 60.0 W light bulbs that can be put in a household circuit (V= 110V) without tripping the circuit breaker if the maximum current through the circuit is 20.0 A?

Homework Equations

P= Vi

The Attempt at a Solution

P= VI => I=P/V for each light bulb's current...I= 60/110v = 0.545454A for 1 light bulb.

Max 20.0A so 20/0.545454 = 36.66666666 => 36 light bulbs you can put max.

Please check see if i got it right.

 

[PeterO]

Homework Statement

What is the maximum number of 60.0 W light bulbs that can be put in a household circuit (V= 110V) without tripping the circuit breaker if the maximum current through the circuit is 20.0 A?

Homework Equations

P= Vi

The Attempt at a Solution

P= VI => I=P/V for each light bulb's current...I= 60/110v = 0.545454A for 1 light bulb.

Max 20.0A so 20/0.545454 = 36.66666666 => 36 light bulbs you can put max.

Please check see if i got it right.

The logic is good. In practice you may be in trouble since a 60 W light globe briefly operates at more than 60W when it is first turned on, so if you switched them all on at once the fuse may trip.

 

[Jabababa]

ahh thank you. This is for an assignment so we are not actually going to do that in real life. Just wondering if my calculations are right!